Thevenin resistance can be found by taking the ratio (o.c = open circuit, s.c = short circuit, Vs = supply voltage, VL = load voltage)
A. $$\frac{{{{\text{V}}_{{\text{OC}}}}}}{{{{\text{I}}_{{\text{SC}}}}}}$$
B. $$\frac{{{{\text{V}}_{{\text{SC}}}}}}{{{{\text{I}}_{{\text{OC}}}}}}$$
C. $$\frac{{{{\text{V}}_{\text{S}}}}}{{{{\text{I}}_{\text{S}}}}}$$
D. $$\frac{{{{\text{V}}_{\text{L}}}}}{{{{\text{I}}_{\text{L}}}}}$$
Answer: Option A

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